Brake Booster..... ?

[solidaxel]

Where do you tap vacuum from a 5.3 to a stock 78 pick up brake booster?

[Clyde65]

what year motor? I believe there should be a port on the back of the intake. thats where mine is...

[solidaxel]

The 5,3 is a 2004.
There is a port that goes into the valve cover (maybe T the PCV?)

[Robznob11]

At the back of the intake there is a round port . If you look at the back above where your oil press sender you should see it. Gm sells a barb that fits in there. Ill have to wait till i get home to get the pt # but i got mine at scoggin dicky in lubbock for about 8 or 10 bucks.
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[Robznob11]

Originally Posted by solidaxel

The 5,3 is a 2004.
There is a port that goes into the valve cover (maybe T the PCV?)

definatly wont hook to valve cover lol! But i guess if you had an intake with the purge valve behind the tb you could remove that and tap that hole. But if yours has the port in back id use it caus the barb is made for it.
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[solidaxel]

Thanks.
The manifold end of the PCV hose, not the valve cover!!

[Robznob11]

Hee hee! I gotcha lol theres always a wise guy and he usually sticks his foot in his mouth lol when i get to the house ill check the pt # on that barb and post it up if no one has by then.
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[83_shortwide]

12559760

Double check me on that

[BR3W CITY]

This is 12559760


1/2 Nipple.

[solidaxel]

Does that replace the plug in the left rear of the phelem.
I will take both numbers to the dealer and see what he puts on the counter.
I also need vacuum for the HVAC, Will a "T" work here also

Thanks

[ls1nova71]

Yes, The nipple replaces the plug. There's a red plastic piece that you pushin on while pulling out the plug. As for the A/C, there is a fitting on the right side of the intake that you can break a little tab off of and hook the HVAC hose to it. Post #204 of the build thread of my rusty '71 in my sig has pics if you're not sure what I'm talking about.

[solidaxel]

Originally Posted by ls1nova71

Yes, The nipple replaces the plug. There's a red plastic piece that you pushin on while pulling out the plug. As for the A/C, there is a fitting on the right side of the intake that you can break a little tab off of and hook the HVAC hose to it. Post #204 of the build thread of my rusty '71 in my sig has pics if you're not sure what I'm talking about.

Thanks, that helps (#204), I would never thought of breaking something to find a port!
The red push pull plug?
What part is removed?
I will try and push & pull !!

[ls1nova71]

When you pull on the plug the red part will try to come with it and not allow the plug to come out, take a small screwdriver and push the red part back in while still pulling the plug. Its really easy once you try it.
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[BR3W CITY]

There is another plug on some of the hydroboost trucks, but it still looks like a plastic vacuum plug. (just not red iirc). I couldn't find the number but I sent TruckDude off looking for it.

[solidaxel]

Originally Posted by ls1nova71

Yes, The nipple replaces the plug. There's a red plastic piece that you pushin on while pulling out the plug. As for the A/C, there is a fitting on the right side of the intake that you can break a little tab off of and hook the HVAC hose to it. Post #204 of the build thread of my rusty '71 in my sig has pics if you're not sure what I'm talking about.

You were right...............push the red sleeve ,and pull the black plug out!!!
Ordered the part number from the local Chevy dealer, $8.11 with tax

...........Next item on the list!!!!


When I run out of things to do I am going back and read your build, I guess I should have already read it, because of all the questions you could have answered. Nice work

Thanks for the help